Need help... PX 200 II's plug shorted out.

My dear PX 200 II's plug has shorted out. One of the channels is not getting sound, and the other one is cutting out. I know the problem is at the plug, since I've fidgeted with it a bit and noticed changes in the sound when I did. They are just old enough for the warranty to be void, and the rest of them are in pristine shape.

I called an audio repair shop in my town, it would cost $40-50 to get it fixed. I don't know how to do it myself.

Break out the soldering iron! There's a whole lot of documentation on Youtube on how to resolder broken headphone jacks/wires. I repaired my modded headphone once by soldering a jack from a "scrapped" Bose can (lolmflol). I done em with cheapo Radioshack soldering irons.

There seems to be a problem with my PX 200-iis. When I use the inline volume control the sound crackles and disappears and reappears from both the left and right speakers. I have to more or less continually fiddle with the inline volume control to get close to a balanced full sound, and even knocking it slightly can ruin the sound again.